Help needed please.  I have done a search on this and have done the following tests - 1989 K100/2:

Connecting pin A2 to 45 (15) operates the fan - works fine.

Connecting A3 to ground operates the high temp light - also works fine.

Connecting E to ground should operate the fan - it doesn't (does this only work with the relay connected? - tried both ways).

What happens when some idiot (ahem) connects pin 9 to ground instead of A3?  I think (hope) this will only have power when the starter button operates the FI Relay?

So assuming I haven't fried anything, can I assume my Fan Relay is not working?

Hang on, I may have been even more stupid.  If pin 9 gets power from the FI Relay, and if this doesn't come into play until the engine starts, and pin 9 is the power for the Temp Relay coil, does this mean the engine has to be running to do the grounding pin E test?

OK I think I've found the answer, in this thread:
https://www.k100-forum.com/t9524-temperature-relay-cooling-fan-not-working
The engine must be running and the Relay installed to carry out the earthing test.

So, without the engine running, there will be no power at pin 9, yes?  I think perhaps I've been lucky this time.

good find

have fun